EXPERTISE
Mikołaj is the Co-Head of the Warsaw Tax Practice, a Polish qualified lawyer (radca prawny), qualified tax advisor, and of counsel. He is also an associate of the International Bureau of Fiscal Documentation (IBFD) in Amsterdam. Mikołaj has over 20 years’ experience in providing tax and legal advice to international and domestic clients. His areas of expertise cover tax advice related to cross-border and domestic restructurings, including mergers/demergers and acquisitions of international and domestic entities, tax planning, tax litigation and transfer pricing. Mikołaj has advised on the tax aspects of major transactions.
Recent highlights*:
- Banco Santander S.A.: advising on the tax issues of the takeover of AIG Bank Polska S.A. and the merger of AIG Bank Polska S.A. with Santander Consumer Bank S.A.
- Alinda Capital Partners: advising on the tax aspects of the financing and acquisition of Emitel sp. z o.o., the leading television and radio broadcast infrastructure provider in Poland.
- Oaktree Capital/Griffin Real Estate: advising on the tax aspects of the acquisition of the RENOMA shopping centre located in Wrocław.
- BP: advising on the tax issues of the intra-group multijurisdictional merger between its regional fuel-distribution companies present in Germany, Poland, Belgium, the Netherlands, and Austria, resulting in the establishing of the European company Deutsche BP AG ('Societas Europaea').
- NIAM (a leading Swedish real estate private equity firm): advising on all the tax aspects of the sale of Silesia Business Park A and B located in Katowice to a Philippine investor ISOC Group.
* Experience gained prior to joining Addleshaw Goddard
- Education
- 2005 Chartered Tax Adviser Examination
- 1993 – 1998 University of Warsaw, Master of Laws
- Year qualified
- 2007 Attorney-at-Law, Warsaw Bar Association (OIRP)
- Recognition
- Legal 500 EMEA, Tax Poland, Leading Individuals
- Testimonials
"I have worked with Mikołaj Bieniasz for many years now – he combines deep technical knowhow and experience with a practical and commercial approach to solving complex tax problems. He is just as comfortable facing down opposing counsel as he is representing our interests in court and before the tax authorities." Legal 500 EMEA 2023, Tax: Poland
"Mikołaj Bieniasz combines broad knowledge of tax issues with specialised expertise, addressing a diverse range of client needs effectively. He also fosters a collaborative environment within the team, ensuring that all members are aligned and working towards optimal client outcomes." Legal 500 EMEA 2025, Tax, Poland
- Languages
- Polish – native
- English – fluent